Motor fuel product



Patented May 27, 1941 MOTOR FUEL PRODUCT Thomas H. Rogers and Vanderveer Voorhees,

Hammond, Ind.,' assignors, by mesne assignments, to Gasoline Antioxidant Company, 0111- cago, Ill., a corporation of Delaware No Drawing. Application April 8, 1937, Serial No. 135,723

3 Claims. (01. 44-9) and 1-8 diamino naphthalene as gum inhibitors This invention relates to the stabilization of motor fuels and particularly to the stabilization of cracked gasolines which and develop gums.

In particular, the present invention relates to the treatment of highly cracked gasolines or hydrocarbon motor fuel distillates of the type which are normally unstable, particularly with respect to gum formation on storage, and which. having an initial anti-knock rating superior to that of straight-run gasoline, tend to deteriorate in antiknock rating.

The tendency of products of this type to develop gum forming constituents, is indicated, for

example, by their oxygen absorption induction period, determined, for example, as described in the article by Voorhees and Eisinger in Procee ings of the American Petroleum Institute, Section 2, January 3, 1929, page 1'10. The oxygen absorption induction period is the-period of time for which the rate of absorption of oxygen by a 100 cc. sample of motor fuel maintained in a liter flask at an elevated temperature of 210-212 F. in an atmosphere of oxygen under about 1.5

to 2 atmospheres pressures remains below 1 cc.

per minute.

It has been customary to treat motor fuels of the type indicated above with substances such as strong sulphuric acid, Fullers earth and the like to remove these gum-forming constituents. Such treatments remove a substantial amount of the unsaturated constituents in the gasoline. Since these unsaturated constituents are partly responsible for the high anti-knock properties of cracked gasoline, it is apparent that such treatment destroys some of the desirable qualities of cracked gasolines. In addition, these treatments result in a loss in volume of motor fuel.

The object of the present invention is to provide a new class of organic materials that may be added to these gum-forming cracked gasolines, in small amounts, to inhibit or substantially retard the formation of gum therein. The amount of these gum inhibitors employed to stabilize a cracked gasoline will vary with the particular cracked gasoline to be treated but, in general, the amount of'the inhibitor usedwill vary from 0.01 to 0.001%. With some motor fuels, the amount used will be as low as 0.0006%. 3 Even in these small concentrations, the class of tend to deteriorate for cracked gasolines. In additlomthese diamino naphthalenes may have hydrocarbon radicals such as the methyl, ethyl, propyl, butyl and amyl radicals attached to the naphthalene ring or one or both of the amino groups. In other words, these inhibitors are naphthalene hydrocarbons .having two amino nitrogen atoms attached to the naphthalene nucleus.

To illustrate the effectiveness of the above mentioned compounds, 0.005% of 1-5 diamino naphthalene was added to a cracked gasoline having an initial induction period of 305 minutes and it was found that this amount of the inhibitor'raised the induction period to 680 minutes. It is apparent from the small amount of inhibitor used that the above mentioned class of compounds is very effective as a gum inhibitor for cracked gasoline during storage.

In addition to using the compounds indicated above as gum inhibitors in cracked gasoline, these agents may be used in blends of motor fuels containing substantial amounts of gum forming cracked gasoline or blends of motor fuels congum formation in motor fuels of the character described, we prefer to add the inhibitor to the motor fuel prior to the formation of gum.

This application is a continuation-impart of our co-pending application 438,246, filed March 22, 1930, now Patent No. 2,080,928.

We claimt 1. A motor fuel product comprising cracked carbon distillates of the character of gasoline which normally tend to develop gum on storage, which comprises incorporating therein prior to the formation of appreciable amounts of gum a small proportion of a naphthalene diamine.

-3. A motor fuel product comprising cracked hydrocarbon distillates of the character of gasoline which normally tend to deteriorate and develop gum, said product containing a small proportion of a naphthalene hydrocarbon in which two of the hydrogens of the naphthalene ring have been replaced by amino groups.

' moms H. ROGERS.

VANDERVEER. VOORHEES. 

